I was told that the optional rule would automatically adjust the time for daylight savings. It did for a while but a few weeks ago the time on the HT286’s changed and is now one hour behind the correct time. I am based in the UK.

I also use the the same optional rule in my Linksys SPA941 VoIP phone and that has the correct time and is also pointing to the same NTP server ip address.

Does anyone know what I am doing wrong or does anyone know the correct optional rule for daylight savings in the UK.

I have tried several optional rule configurations and they are either ahead or behind by one hour.